Brian G Posted October 6, 2004 Report Posted October 6, 2004 I assume that at least some PEX is rated for hot water, but is all of it so rated or are there different types for that? I found some used as piping on a relief valve (ASTMF 876/877). They reduced it to 1/2", so it has to go anyway, I'm just curious. Brian G. Ain't PEX Them Thar Chest Muskles? [:-dunce]
Bill Kibbel Posted October 6, 2004 Report Posted October 6, 2004 I asked a similar question years ago when CPVC and even PB started appearing as T&PR extensions. The answer I got from the gurus was it should be rated at 210 degrees (the max temp. at which the valves are supposed to open). Anyone else see garden hose for T&PR extensions? What is their temp. rating?
Jim Katen Posted October 6, 2004 Report Posted October 6, 2004 Originally posted by hausdok . . . Otherwise, if the T & P did blow the thing might flail around like a woman at a bluelight sale in WalMart. ONE TEAM - ONE FIGHT!!! Mike Michael, I am shocked. Shocked and appalled that you would say such a thing. Blue light sales are a *K-Mart* thing. Not a WalMart thing. - Jim Katen, Oregon
Brian G Posted October 6, 2004 Author Report Posted October 6, 2004 Originally posted by inspecthistoric Anyone else see garden hose for T&PR extensions? What is their temp. rating? I haven't seen that, but about 8 out of 10 I see across the line in Bama has nothing on the relief valve (the infamous "air pipe"). [:-bigeyes Brian G.
Paul MacLean Posted October 6, 2004 Report Posted October 6, 2004 For years I used to write any plastic T&P drainpipe as "not rated for 210 degrees or 150psi, the temperature and pressure at which the T&P valve opens." I took a lot of grief and got slapped around by codes permitting CPVC (as others have stated). So I backed off and don't make such a big deal about it any more. I just make sure the CPVC isn't close to the flue and discharges correctly. I have yet to see PEX on a water heater; in fact, seeing PEX at all is very rare around here.
Jim Baird Posted October 27, 2004 Report Posted October 27, 2004 ...For years I used to write any plastic T&P drainpipe as "not rated for 210 degrees or 150psi, the temperature and pressure at which the T&P valve opens." Hey Paul, what you have to remember about the PT discharge is that it is open ended, so the pressure-temp rating for the pipe is moot. I think "size is what matters" here.
Paul MacLean Posted October 27, 2004 Report Posted October 27, 2004 Originally posted by Jim Baird ...For years I used to write any plastic T&P drainpipe as "not rated for 210 degrees or 150psi, the temperature and pressure at which the T&P valve opens." Hey Paul, what you have to remember about the PT discharge is that it is open ended, so the pressure-temp rating for the pipe is moot. I think "size is what matters" here. Jim...we hope it's open ended![:-timebm]
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